package org.apache.velocity.runtime.resource.util;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.velocity.runtime.resource.loader.StringResourceLoader;

/**
 * Default implementation of StringResourceRepository. Uses a HashMap for
 * storage
 * 
 * @author <a href="mailto:eelco.hillenius@openedge.nl">Eelco Hillenius</a>
 * @author <a href="mailto:henning@apache.org">Henning P. Schmiedehausen</a>
 * @version $Id: StringResourceRepositoryImpl.java 685724 2008-08-13 23:12:12Z nbubna $
 * @since 1.5
 */
public class StringResourceRepositoryImpl implements StringResourceRepository {
	/**
	 * mem store
	 * 
	 * 把Collections.synchronizedMap替换成ConcurrentHashMap
	 */

	protected Map<String, StringResource> resources = new ConcurrentHashMap<>();
	// protected Map resources = Collections.synchronizedMap(new HashMap());

	/**
	 * Current Repository encoding.
	 */
	private String encoding = StringResourceLoader.REPOSITORY_ENCODING_DEFAULT;

	/**
	 * @see StringResourceRepository#getStringResource(java.lang.String)
	 */
	public StringResource getStringResource(final String name) {
		return resources.get(name);
	}

	/**
	 * @see StringResourceRepository#putStringResource(java.lang.String,
	 *      java.lang.String)
	 */
	public void putStringResource(final String name, final String body) {
		resources.put(name, new StringResource(body, getEncoding()));
	}

	/**
	 * @see StringResourceRepository#putStringResource(java.lang.String,
	 *      java.lang.String, java.lang.String)
	 * @since 1.6
	 */
	public void putStringResource(final String name, final String body, final String encoding) {
		resources.put(name, new StringResource(body, encoding));
	}

	/**
	 * @see StringResourceRepository#removeStringResource(java.lang.String)
	 */
	public void removeStringResource(final String name) {
		resources.remove(name);
	}

	/**
	 * @see org.apache.velocity.runtime.resource.util.StringResourceRepository#getEncoding()
	 */
	public String getEncoding() {
		return encoding;
	}

	/**
	 * @see org.apache.velocity.runtime.resource.util.StringResourceRepository#setEncoding(java.lang.String)
	 */
	public void setEncoding(final String encoding) {
		this.encoding = encoding;
	}
}
